The purpose of this paper is to present an overview of the design for both the full scale and pilot scale seawater reverse osmosis (SWRO) pre-treatment plant comprising Enflo-DAF™ dissolved air flotation (DAF) technology and dual media filtration (DMF) proposed and operating respectively at Ras Al Khair site in Saudi Arabia. The application of both DAF and DMF in the municipal water industry is regarded as well established; however the application of DAF to the treatment of seawater particularly at elevated temperatures and which is also prone to Red Tide or severe algae events is relatively new and there is a limited amount of experience in this area.